Chuck.



PATENTED AUG. 23, 1904 'A. A. NORTH. CHUCK. APPLICATION FILED FEB. 9, 1904.

UNITED STATESv Patented August 23, 1904.

PATENT OFFICE.

CHUCK.

SPECIFICATION forming part of Letters Patent No. 768,396, dated. August 23, 1904. Application filed Iebruary 9, 1904:. Serial No. 192,792. (No model.)

To all whom it may concern:

Be it known that I, ALBERT A. NoRrrn-a citizen of the United States of America, residing at New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Chucks, of

which the following is a specification.

This invention relates to improvements in drill-chucks; and the object of the invention is to provide a positive driving mechanism-of a constructlon which w1ll permlt of a wide range of use of chucks of thls description.

In the drawings, Figure 1 represents a cen-, tral vertical section of a chuck embodying my invention. Fig. 2 is a sectional view on the line 2 2 of Fig. 1.

The embodiment of the invention shown provides a positive driving attachment, which may be used either for drilling or tapping and which may be removed when the character of work requires a continuous opening through the chuck-body.

In the chuck-body a are converging slots 6, in which are located the jaws c, which areengaged by the nut cl to move them in and out of the chuck-body, the cap f, secured to the chuck-body by the screws g, holding the nut in plate. The chuck-body has a central opening, as at it. When the jaws are in their extreme open position, their faces lie flush with the walls of this opening through the chuck-body, and, as is evident, the capacity of the chuck is limited by the size of this central opening. A shoulder l is left in this central opening, the walls of the opening back of the shoulder being screw-threaded, as at m. The positive driving member a rests on this shoulder, and is thereby held against movement in one direction. This driving member has 'a shank 'r, which has threads engaging with the threaded portion 171 back of the shoulder Z to hold the driving member in position. The outer face of this driving member is slotted, as at s, the tools having slabbedoff ends 8, which fit in the slot.

The depth of the driving member fills the will thus be seen that the chuck'is adaptable for use with taps as well as for drilling. A further advantage of this construction is I the removable feature of the driving member,

which leaves an opening entirely through the chuck, so that if occasion arises forpassing the work clear through the chuck this same chuck can be used. In order to remove the driving member, it is onlynecessary to open the jaws to the widest extent and unscrew the driving member with the aid of a suitable tool.

I claim as my invention 1. The'combination with achuck-body having a central bore with a portion thereof di-' minished or reduced in diameter, and a plurality of converging ways, of slidable jaws fitted in said ways, means for moving said jaws, and a driving member fitted in the reduced portion of the bore in the body, said diameter than the rest of the bore, and adriving member screwing into said body and having a slotted head and a shoulder abutting against the said diminished portion of thebore, with annularlydisposed sliding jaws adapted in one position to embracesaid head and prevent the same from screwing out of its seat in the bore of the body.

3. The combination witha chuck-body hav ing converging ways, a central bore wlth aportion thereof threaded and with a shoulder at the end of said threaded portion and a driving member screwing into said threaded portion of the bore and abutting against said driving member having a slotted head of greater diameter than the diminished bore and shoulder, the said driving member having a the same from being screwed outol the threadslotted head of a diameter equal to the diamed portion of the bore. 10 eter of the bore; of jaws arranged in said eon- In testimony whereof I ailix my signature in verging ways, means for moving said jaws in presence of two witnesses. 5 the ways, the said jaws and the said converg- ALBERT A. NORTH. ingways being so disposed that When the jaws \Nitnesses: 7 are moved inwardly they will embrace the E. J. SKINNER,

outer end of said driving member and prevent L. D. CARTER. 

